ABDALLA, H.; AHARONIAN, F.; AIT BENKHALI, F.; ANGÜNER, E.O.; ARAKAWA, M.; ARCARO, C.; ARMAND, C.; ARRIETA, M.; BACKES, M.; BARNARD, M.; BECHERINI, Y.; BECKER TJUS, J.; BERGE, D.; BERNLÖHR, K.; BLACKWELL, R.; BÖTTCHER, M.; BOISSON, C.; BOLMONT, J.; BORDAS, P.; BREGEON, J.; BRUN, P.; BRYAN, M.; BÜCHELE, M.; BULIK, T.; BYLUND, T.; CAPASSO, M.; CAROFF, S.; CAROSI, A.; CASANOVA, S.; CERRUTI, M.; CHAKRABORTY, N.; CHAND, T.; CHANDRA, S.; CHAVES, R.C.G.; CHEN, A.; CONDON, B.; DAVIDS, I.D.; DEIL, C.; DEVIN, J.; DEWILT, P.; DIRSON, L.; DJANNATI-ATAI, A.; DMYTRIIEV, A.; DONATH, A.; DOROSHENKO, V.; DRURY, L.O'C.; DYKS, J.; EGBERTS, K.; EMERY, G.; ERNENWEIN, J.-P.; ESCHBACH, S.; FEGAN, S.; FIASSON, A.; FONTAINE, G.; FUNK, S.; FÜSSLING, M.; GABICI, S.; GALLANT, Y.A.; GATÉ, F.; GIAVITTO, G.; GLAWION, D.; GOTTSCHALL, D.; GRONDIN, M.-H.; HAHN, J.; HAUPT, M.; HEINZELMANN, G.; HENRI, G.; HERMANN, G.; HINTON, J.A.; HOFMANN, W.; HOISCHEN, C.; HOLCH, T.L.; HOLLER, M.; HORNS, D.; HUBER, D.; IWASAKI, H.; JAMROZY, M.; JANKOWSKY, D.; JANKOWSKY, F.; JOUVIN, L.; JUNG-RICHARDT, I.; KASTENDIECK, M.A.; KATARZYŃSKI, K.; KATSURAGAWA, M.; KATZ, U.; KHANGULYAN, D.; KHÉLIFI, B.; KING, J.; KLEPSER, S.; KLUŹNIAK, W.; KOMIN, Nu.; KOSACK, K.; KRAUS, M.; LAMANNA, G.; LAU, J.; LEFAUCHEUR, J.; LEMIÈRE, A.; LEMOINE-GOUMARD, M.; LENAIN, J.-P.; LESER, E.; LOHSE, T.; LÓPEZ-COTO, R.; LYPOVA, I.; MALYSHEV, D.; MARANDON, V.; MARCOWITH, Alexandre; MARIAUD, C.; MARTÍ-DEVESA, G.; MARX, R.; MAURIN, G.; MEINTJES, P.J.; MITCHELL, A.M.W.; MODERSKI, R.; MOHAMED, M.; MOHRMANN, L.; MOORE, C.; MOULIN, E.; MURACH, T.; NAKASHIMA, S.; DE NAUROIS, M.; NDIYAVALA, H.; NIEDERWANGER, F.; NIEMIEC, J.; OAKES, L.; O'BRIEN, P.; ODAKA, H.; OHM, S.; OSTROWSKI, M.; OYA, I.; PANTER, M.; PARSONS, R.D.; PERENNES, C.; PETRUCCI, P.-O.; PEYAUD, B.; PIEL, Q.; PITA, S.; POIREAU, V.; PRIYANA NOEL, A.; PROKHOROV, D.A.; PROKOPH, H.; PÜHLHOFER, G.; PUNCH, M.; QUIRRENBACH, A.; RAAB, S.; RAUTH, R.; REIMER, A.; REIMER, O.; RENAUD, Matthieu; RIEGER, F.; RINCHIUSO, L.; ROMOLI, C.; ROWELL, G.; RUDAK, B.; RUIZ-VELASCO, E.; SAHAKIAN, V.; SAITO, S.; SANCHEZ, D.A.; SANTANGELO, A.; SASAKI, M.; SCHLICKEISER, R.; SCHÜSSLER, F.; SCHULZ, A.; SCHUTTE, H; SCHWANKE, U.; SCHWEMMER, S.; SEGLAR-ARROYO, M.; SENNIAPPAN, M.; SEYFFERT, A.S.; SHAFI, N.; SHILON, I.; SHININGAYAMWE, K.; SIMONI, R.; SINHA, A.; SOL, H.; SPECOVIUS, A.; SPIR-JACOB, M.; STEENKAMP, R.; STEGMANN, C.; STEPPA, C.; TAKAHASHI, T.; TAVERNET, J.-P.; TAVERNIER, T.; TAYLOR, A.M.; TERRIER, R.; TIZIANI, D.; TLUCZYKONT, M.; TRICHARD, C.; TSIROU, M.; TSUJI, N.; TUFFS, R.; UCHIYAMA, Y.; VAN DER WALT, D.J.; VAN ELDIK, C.; VAN RENSBURG, C.; VAN SOELEN, B.; VASILEIADIS, George; VEH, J.; VENTER, C.; VINCENT, P.; VINK, J.; VOISIN, F.; VÖLK, H.J.; VUILLAUME, T.; WADIASINGH, Z.; WAGNER, S.J.; WAGNER, R.M.; WHITE, R.; WIERZCHOLSKA, A.; YANG, R.; YONEDA, H.; ZABOROV, D.; ZACHARIAS, M.; ZANIN, R.; ZDZIARSKI, A.A.; ZECH, A.; ZIEGLER, A.; ZORN, J.; ŻYWUCKA, N.

doi:10.1093/mnras/stz1031

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Monthly Notices of the Royal Astronomical Society. 2019, vol. 486, n° 3, p. 3886-3891

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PKS 1830–211 is a known macrolensed quasar located at a redshift of z = 2.5. Its high-energy gamma-ray emission has been detected with the Fermi-Large Area Telescope (LAT) instrument and evidence for lensing was obtained by several authors from its high-energy data. Observations of PKS 1830–211 were taken with the High Energy Stereoscopic System (H.E.S.S.) array of Imaging Atmospheric Cherenkov Telescopes in 2014 August, following a flare alert by the Fermi-LAT Collaboration. The H.E.S.S observations were aimed at detecting a gamma-ray flare delayed by 20–27 d from the alert flare, as expected from observations at other wavelengths. More than 12 h of good-quality data were taken with an analysis threshold of ∼67 GeV. The significance of a potential signal is computed as a function of the date and the average significance over the whole period. Data are compared to simultaneous observations by Fermi-LAT. No photon excess or significant signal is detected. An upper limit on PKS 1830–211 flux above 67 GeV is computed and compared to the extrapolation of the Fermi-LAT flare spectrum.Read less <

English Keywords

gravitational lensing: strong

diffuse radiation

gamma-rays: galaxies

gamma ray: emission

GLAST

HESS

Cherenkov counter

gravitation

energy: threshold

redshift

imaging

quality

quasar

photon

galaxy

lens

flux

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H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830–211

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